| 摘要 |
1490863 Injection moulding and extrusion of pigmented thermosets BRITISH INDUSTRIAL PLASTICS Ltd 23 Sept 1975 [1 Oct 1974] 42516/74 Heading B5A A method of making substantially homogeneously pigmented extrudates or mouldings from a thermosetting moulding material, comprises roughly blending a pigment component with an aminoplast moulding material having an average particle size not greater than 150 microns, before, during or after supplying the pigment and moulding material to the hopper of an extruder or injection moulding machine having a screw housing with grooving extending longitudinally throughout a major portion of the bore of the housing downstream of the feed zone, and effecting complete dispersion of the pigment through the moulding material whilst in the extruder or injection moulding machine. The pigment component may be a pigment per se or a masterbatch consisting of a pigment homogeneously blended with urea or melamine formaldehyde resin.
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